激光选区熔化熔池视频监测与评价

Molten Pool Video Monitoring and Evaluation of LPBF

为对激光选区熔化的加工过程进行监测和反馈调节,建立一套同轴高速相机熔池图像采集系统,研究10 kHz高速熔池图像在线实时监测与评价方法。完成有限元的建模,通过仿真分析熔池的正常形貌;基于FPGA开发高速图像采集与处理系统,实现10 kHz图像的实时分析、处理和输出。把高速视频系统在粉末床激光选区熔化(laser powder bed fusion,LPBF)技术上集成,并开展实验测试与验证。实验结果表明:该系统可实时监测和输出熔池的评价参数,为激光选区熔化闭环控制奠定技术基础。

In order to monitor and adjust the process of selective laser melting,a set of molten pool image acquisition system with coaxial high-speed camera was established,and the online real-time monitoring and evaluation method of 10 kHz high-speed molten pool image was studied.The finite element modeling was completed,and the normal morphology of the molten pool was analyzed by simulation.The high-speed image acquisition and processing system was developed based on FPGA,and the real-time analysis,processing and output of 10 kHz images were realized.The high-speed video system is integrated on the laser powder bed fusion(LPBF)technology,and the experimental test and verification are carried out.The experimental results show that the system can monitor and output the evaluation parameters of the molten pool in real time,which lays a technical foundation for the closed-loop control of selective laser melting.